The site here, http://acorn.xara.hosting/Jarring/, is a demonstration of how the Xara Desktop applications (XDA) handle images.

It is a moderate to complex analysis.
Basically, drop an image onto a design and the XDA automatically "optimises" it ==> instead use the Blank Photo template and the original dimensions are retained. Copy and Paste this into your design.
Drag this image onto your page and the XDA creates a nominal 500px box showing the image ==> check the dpi and if far greater than 96 dpi, you will see a fuzzy outcome.
The XDA may have Retina set ==> images are four times the resolution and your output has image filename suffixed with @2.

Sadly, XDA has introduced the concept of an Image Filename:
You can now control the filename with which any image is published in a website or web document, which can help SEO and your position in image search. Select the object and open Utilities > Web Properties > Image tab. In the Image section of the dialog you can set the preferred filename to be used. If the filename is not unique within the current website/document, Designer will append a number to the name to make it unique.
Sad, because the scaling of an image is deemed to be "unique" ==> every non-"unique" image then needs to be generated, adding to the size of the web assets.

My approach uses Placeholder code of form <img src="index_htm_files/<uniqueImageFileName>.jpg" width="100%" height="100%" /> ==> the source (src) can be anything on the Internet as well.

The demonstration allows you to greatly increase the width of the browser to see the JPEG artefacts ==> the Xara approach creates many unnecessary "unique" images with lossy rendering depending on the presented image size.
My approach uses the one image, suitably scaled ==> the last page is 100 images for the price of one.

In your browser, pick any image, right-click and select View Image in a new Tab ==> you can then change the zoom and gauge the clarity.
I would focus on the jars' bases.

Here is the design file:
The Ultimate Xara Picture Holder.xar (1,642kB).

Acorn